Electrostatic precipitator module and desulfurization system including the same

ABSTRACT

An electrostatic precipitator module and a desulfurization system are capable of easily discharging wash water from a wet electrostatic precipitator module. The electrostatic precipitator module includes an arrangement of discharge electrodes and collecting electrodes alternately disposed and spaced apart from each other, the discharge electrodes configured to be charged to a predetermined voltage for generating a corona discharge between the discharge electrodes and the collecting electrodes; and tie rods for fixing the discharge electrodes and the collecting electrodes. Each collecting electrode has a lower edge inclined downward with respect to the ground. The lower edge of each collecting electrode includes separate lower edge portions respectively inclined downward from opposite side ends of the collecting electrode and a lowermost point at which wash water is concentrated and discharged to a discharge guide installed directly under the lowermost points. The discharge guide has a width substantially smaller than the collecting electrode.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.16/215,610, filed on Dec. 10, 2018, which claims benefit of priority toKorean Patent Application Nos. 10-2018-0118517 filed on Oct. 4, 2018 inthe Korean Intellectual Property Office, the disclosure of which isincorporated herein by reference in its entirety.

BACKGROUND OF THE INVENTION Field of the Invention

Exemplary embodiments of the present disclosure relate to anelectrostatic precipitator module and a desulfurization system forcollecting dust contained in exhaust gas and removing sulfur oxides.

Description of the Related Art

In general, acidic components, such as hydrogen chloride (HCl), sulfuroxides (SOx), or hydrogen fluoride (HF), in the exhaust gas generatedduring combustion of materials in boilers, steelworks, or the like oflarge incineration plants or thermal power plants are removed throughvarious methods because they are harmful to humans and cause airpollution.

Among the methods of removing sulfur oxide in exhaust gas, the method ofremoving sulfur compounds in such a manner that a powder, such as slakedlime or activated carbon as a neutralizing agent is dryly injected intoand comes into contact with exhaust gas in the process of dischargingthe exhaust gas is referred to as a dry desulfurization method, and themethod of removing sulfur compounds in such a manner that an aqueousslurry of caustic soda, magnesium hydroxide, or limestone is used as aneutralizing agent and an absorption solution is sprayed onto and comesinto contact with exhaust gas is referred to as a wet desulfurizationmethod.

In wet desulfurization, exhaust gas comes into gas-liquid contact withan absorption fluid containing alkali such as lime, so that SO₂ isabsorbed and removed from the exhaust gas. As a result, the SO₂ absorbedfrom the exhaust gas forms sulfite in the absorption fluid. In order tomake the sulfite stable by oxidation, the method of oxidizing thesulfite by blowing air into an absorption fluid has commonly beenpracticed.

A commonly used wet flue gas desulfurization system is of a so-calledoxidation tank type. In this type of wet flue gas desulfurizationsystem, oxygen-containing gas (typically, air) is blown into a tank ofan absorption tower, in which case the oxygen-containing gas comes intocontact with a slurry (containing a calcium compound such as lime)having sulfur dioxide absorbed therein to oxidize the sulfur dioxide.

Dust is removed from the air discharged from the desulfurization systemby the electrostatic precipitator. Typically, the electrostaticprecipitator is installed separately from the desulfurization system tocollect the dust contained in flue gas.

In general, particulate substances are charged by the corona dischargeof discharge electrodes in the electrostatic precipitator and thecharged particulate substances are collected on a collecting plate byelectrostatic force. In a wet electrostatic precipitator, wash water issupplied to remove the dust adsorbed on a collecting plate and a trayfor collecting the wash water is installed in the lower portion of anelectrostatic precipitator module. However, the tray is problematic inthat it obstructs the flow of exhaust gas and decreases the flow ratethereof.

RELATED ART DOCUMENT

[Patent Document]

(Patent Document 001) Korean Patent No. 10-1478770 (Jan. 5, 2015)

SUMMARY OF THE INVENTION

The present disclosure has been made in view of the above background,and an object thereof is to provide an electrostatic precipitator moduleand a desulfurization system capable of easily discharging wash waterfrom a wet electrostatic precipitator module.

Other objects and advantages of the present disclosure can be understoodby the following description, and become apparent with reference to theembodiments of the present disclosure. Also, it is obvious to thoseskilled in the art to which the present disclosure pertains that theobjects and advantages of the present disclosure can be realized by themeans as claimed and combinations thereof.

In accordance with one aspect of the present disclosure, anelectrostatic precipitator module may include an arrangement ofdischarge electrodes and collecting electrodes alternately disposed andspaced apart from each other, the discharge electrodes configured to becharged to a predetermined voltage for generating a corona dischargebetween the discharge electrodes and the collecting electrodes; and tierods for fixing the discharge electrodes and the collecting electrodes,and each of the collecting electrodes may have a lower edge inclineddownward with respect to the ground.

The lower edge of each collecting electrode may include separate loweredge portions respectively inclined downward from opposite side ends ofthe collecting electrode.

The lower edge of each collecting electrode may include a lowermostpoint at which wash water flowing down from the collecting electrode isconcentrated and discharged to a discharge guide installed directlyunder the lowermost points.

The discharge guide may have a width substantially smaller than that ofthe collecting electrode. The width of the discharge guide may rangefrom 1/100 to 1/10 of that of the collecting electrode.

The discharge guide may extend in a stacking direction of the collectingelectrodes and may have a bottom surface that decreases in height towardeither extreme of the discharge guide.

Each collecting electrode may have a fixing hole formed near the loweredge to receive a hanger fixing rod.

The hanger fixing rod may be coupled with a support hanger forsupporting the discharge guide. The support hanger may include aplurality of connection protrusions protruding upward for insertion ofthe lower portions of the respective collecting electrodes, and each ofthe connection protrusions may have a support hole formed for insertionof the hanger fixing rod.

The discharge guide may include two sidewalls and a bottom plateconnected to lower portions of the sidewalls, and the discharge guidemay have a plurality of support rings protruding upward from thesidewalls to be coupled to the hanger fixing rod.

The electrostatic precipitator module may further include a guideprotrusion formed on a lower portion of each collecting electrode suchthat wash water flowing along surfaces of the collecting electrode istransferred toward the center of the collecting electrode, the guideprotrusion extending in a width direction of the collecting electrode.

The electrostatic precipitator module may further include a firstreinforcing rod that is fixedly installed at and protrudes from a lowerportion of each discharge electrode and is configured to be insertedinto slots formed in first setting beams respectively disposed atopposite ends of the first reinforcing rod. The first setting beams maybe installed to pass through clearance grooves respectively formed inboth ends of the lower side of each of the collecting electrodes.

The electrostatic precipitator module may further include a secondreinforcing rod that is fixedly installed at and protrudes from an upperportion of each collecting electrode and is configured to be insertedinto slots formed in second setting beams respectively disposed atopposite ends of the second reinforcing rod.

The tie rods may be inserted into the discharge electrodes to fix thedischarge electrodes. The tie rods may include first tie rods passingthrough second holes formed in the collecting electrodes, and second tierods inserted into the collecting electrodes to fix the collectingelectrodes while passing through first holes formed in the dischargeelectrodes.

In accordance with another aspect of the present disclosure, adesulfurization system may include an absorption tower having an exhaustinlet and an exhaust outlet; a plurality of absorption solution supplypipes extending across the absorption tower, each absorption solutionsupply pipe having a spray nozzle; an electrostatic precipitator moduledisposed on the absorption solution supply pipes and comprising aplurality of discharge and collecting electrodes erected and arranged ina height direction of the absorption tower; and a wash water supply unitdisposed on the electrostatic precipitator module. Each of thecollecting electrodes may have a lower edge inclined downward withrespect to the ground and a lowermost point at which wash water flowingdown from the collecting electrode is concentrated.

It is to be understood that both the foregoing general description andthe following detailed description of the present disclosure areexemplary and explanatory and are intended to provide furtherexplanation of the disclosure as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and other advantages of thepresent disclosure will be more clearly understood from the followingdetailed description taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 is a view illustrating a desulfurization system according to afirst embodiment of the present disclosure;

FIG. 2 is a side view illustrating an electrostatic precipitator moduleinstalled within the desulfurization system according to the firstembodiment of the present disclosure;

FIG. 3 is a perspective view illustrating the electrostatic precipitatormodule according to the first embodiment of the present disclosure;

FIG. 4 is a front view illustrating one discharge electrode according tothe first embodiment of the present disclosure;

FIG. 5 is a front view illustrating one collecting electrode accordingto the first embodiment of the present disclosure;

FIG. 6 is a perspective view illustrating a support hanger and adischarge guide according to the first embodiment of the presentdisclosure;

FIG. 7 is a perspective view illustrating a frame assembly according tothe first embodiment of the present disclosure;

FIG. 8 is a front view illustrating one collecting electrode accordingto a second embodiment of the present disclosure; and

FIG. 9 is a perspective view illustrating a discharge guide according toa third embodiment of the present disclosure.

DESCRIPTION OF SPECIFIC EMBODIMENTS

The present disclosure may be subjected to various modifications andhave various embodiments. Specific embodiments are illustrated in thedrawings and will be described in the detailed description of thepresent disclosure. However, this is not intended to limit the presentdisclosure to specific embodiments. It should be understood that thepresent disclosure includes all modifications, equivalents orreplacements that fall within the spirit and technical scope of thepresent disclosure, and the scope of the present disclosure is notlimited to the following embodiments.

The terminology used in the present disclosure is for the purpose ofdescribing particular embodiments only and is not intended to limit thedisclosure. As used in the disclosure and the appended claims, thesingular forms “a”, “an” and “the” are intended to include the pluralforms as well, unless context clearly indicates otherwise. It will befurther understood that the terms “comprises/includes” and/or“comprising/including” when used in this specification, specify thepresence of stated features, integers, steps, operations, elements,components, and/or groups thereof, but do not preclude the presence oraddition of one or more other features, integers, steps, operations,elements, components, and/or groups thereof.

Exemplary embodiments of the present disclosure will be described belowin more detail with reference to the accompanying drawings. Throughoutthe disclosure, like reference numerals refer to like parts throughoutthe various figures and embodiments of the present disclosure. Incertain embodiments, detailed descriptions of functions andconfigurations well known in the art may be omitted to avoid obscuringappreciation of the disclosure by a person of ordinary skill in the art.For the same reason, some components may be exaggerated, omitted, orschematically illustrated in the accompanying drawings.

Hereinafter, a desulfurization system according to a first embodiment ofthe present disclosure will be described.

FIG. 1 illustrates a desulfurization system 1000 according to a firstembodiment of the present disclosure. The desulfurization system 1000 isto remove sulfur oxides (SOx) contained in the exhaust gas dischargedfrom boilers employed in a facility such as a thermal power plant. Inthe desulfurization system 1000, the sulfur compounds contained inexhaust gas are absorbed and removed through the gas-liquid contactbetween the exhaust gas and an absorption solution.

Referring to FIG. 1, the desulfurization system 1000 may include anabsorption tower 1200, a plurality of absorption solution supply pipes1410, a plurality of absorption solution pumps 1470, an agitator 1460, aplurality of oxidation air supply units 1450, and a perforated plate1420.

The absorption tower 1200 has a columnar shape defining an internalspace and is provided at a lower portion with an exhaust inlet 1310 andat an upper end with an exhaust outlet 1320, each communicating with theinternal space. Exhaust gas is introduced to the absorption tower 1200via the exhaust inlet 1310 and is discharged (exits) via the exhaustoutlet 1320. In doing so, sulfur compounds and fine dust are removedfrom the exhaust gas exiting the absorption tower 1200. That is, thesulfur compounds and fine dust contained in exhaust gas are removed bythe absorption tower 1200.

The exhaust inlet 1310 may have a tubular shape. The exhaust gasgenerated by the combustion of fossil fuel, such as coal consumed by aboiler or the like, is introduced into the absorption tower 1200 throughthe exhaust inlet 1310 and flows upward. The exhaust outlet 1320 may bea rectangular tube protruding laterally from the upper end of theabsorption tower 1200.

The absorption tower 1200 includes a cylindrical section 1210 that has acircular cross-section, a rectangular column section 1250 that isdisposed above the cylindrical section 1210 and has a rectangularcross-section, and an intermediate section 1230 that is disposed betweenthe cylindrical section 1210 and the rectangular column section 1250.The exhaust inlet 1310 communicates with a lateral side of thecylindrical section 1210. The exhaust outlet 1320 communicates with anupper side of the rectangular column section 1250. The intermediatesection 1230 has a contoured structure that includes a lower end havinga circular cross-section for communicating with the cylindrical section1210 and an upper end having a rectangular cross-section forcommunicating with the rectangular column section 1250.

The absorption solution supply pipes 1410 allow a limestone slurry,which is supplied to and stored in the lower portion of the absorptiontower 1200, to be pumped and transferred upward by the absorptionsolution pump 1470 so that an absorption solution is sprayed as finedroplets through spray nozzles (not shown) installed at the upperportion of the absorption tower 1200. The sprayed absorption solutioncomes into contact and reacts with exhaust gas, and an unreacted portionof the absorption solution falls into the lower portion of theabsorption tower 1200 where it is stored again to be recycled by thepumping of the absorption solution pump 1470.

A perforated plate (not shown) may be installed under the absorptionsolution supply pipes 1410, a region where sulfur-containing exhaust gascomes into contact and reacts with the fine droplets of the absorptionsolution being sprayed by the absorption solution supply pipes 1410.This region is called a spray zone. In the spray zone, the sulfurousacid gas contained in exhaust gas becomes sulfurous acid by theabsorption reaction with water; the sulfurous acid produces calciumsulfite by the neutralization reaction with limestone; the producedcalcium sulfite, the water, and the unreacted absorption solution falland are stored; and the absorption solution is recycled.

The calcium sulfite produces plaster and sulfurous acid by the oxidationreaction with oxygen and water in a reservoir 1350 where the absorptionsolution is positioned in the lower portion of the absorption tower1200, and the sulfurous acid produces plaster by the neutralizationreaction with limestone again. For the oxidation reaction, the oxidationair supply units 1450 are connected at regular intervals around the sideof the bottom of the absorption tower 1200.

The agitator 1460 is installed in the lower portion of the absorptiontower 1200 to accelerate the reaction by stirring the limestone slurry.In addition, a slurry supply pipe (not shown) for supplying the slurryto the reservoir 1350 may be connected to the lower portion of theabsorption tower 1200.

The perforated plate 1420 for blocking fine droplets may be installedabove the absorption solution supply pipe 1410, specifically, in theintermediate section 1230.

An electrostatic precipitator module 100, together with a frame assembly20 for supporting the electrostatic precipitator module 100 as shown inFIG. 2, is installed above the perforated plate 1420. The electrostaticprecipitator module 100 may be configured such that a plurality oflayers are stacked. In the present embodiment, the electrostaticprecipitator module 100 is configured such that two layers are stacked,as shown in FIG. 1, though the present disclosure is not limited to thisconfiguration. That is, the electrostatic precipitator module 100 may beconfigured such that a single layer is formed or two or more layers arestacked.

A wash water supply unit 1430 is installed above the electrostaticprecipitator module 100 to remove dust adhered to collecting electrodes13. The present disclosure is not limited to the configuration of thewash water supply unit 1430, which may be embodied by various knownstructures.

FIG. 2 illustrates an electrostatic precipitator module 100 according tothe first embodiment of the present disclosure, including a frameassembly 20, and FIG. 3 is a perspective view of the electrostaticprecipitator module 100.

Referring to FIGS. 2 and 3, the electrostatic precipitator module 100includes discharge and collecting electrodes 12 and 13, first tie rods16, second tie rods 17, first setting beams 14, second setting beams 15,a center setting beam 18 (FIG. 3), a support hanger 25, and a dischargeguide 21. The electrostatic precipitator module 100 may be installed onthe frame assembly 20 in the absorption tower 1200 after being fixed bythe several tie rods and the setting beams.

FIG. 4 illustrates one of the discharge electrodes 12 according to thefirst embodiment of the present disclosure.

Referring to FIG. 4, each of the discharge electrodes 12 has the generalshape of a flat plate forming one of a plurality of discharge fins whichare spaced apart from each other, and each discharge electrode 12 isprovided with a plurality of openings 122 throughout. Thus, thedischarge fins are present and effective around each of the openings 122as well as along the edges of the flat plate. Each opening 122 may havea substantially rectangular shape, and the discharge fins may each havea needle-shaped cross-section. The discharge electrode 12 may have aplurality of first holes 123 through which the second tie rods 17 pass.

A first reinforcing rod 121 is installed at the lower portion of thedischarge electrode 12 and is respectively coupled at opposite ends tothe first setting beams 14 to support the discharge electrode 12. Thefirst reinforcing rod 121 is longer than a width of the dischargeelectrode 12 to protrude from both side ends of the discharge electrode12.

Notches 125 are respectively formed at opposite sides of a lower portionof the discharge electrode 12 to accommodate installation of the firstsetting beams 14. The first reinforcing rod 121 is fixed onto thenotches 125, so that the first reinforcing rod 121 and upper surfaces ofthe notches 125 may be inserted into and fixed to the first settingbeams 14 together.

FIG. 5 illustrates one of the collecting electrodes 13 according to thefirst embodiment of the present disclosure.

Referring to FIG. 5, each of the collecting electrodes 13 has thegeneral shape of a flat plate and is provided with a plurality of secondholes 133 through which the first tie rods 16 pass. To support thecollecting electrodes 13, a second reinforcing rod 131 is disposed at anupper portion of each of the collecting electrodes 13. The secondreinforcing rod 131 is longer than a width of the collecting electrode13 and thus protrudes from both ends of the upper portion of thecollecting electrode 13.

The plurality of discharge and collecting electrodes 12 and 13 arearranged in parallel with each other, and the discharge electrodes 12are arranged at equal intervals between the pluralities of collectingelectrodes 13. The plurality of discharge and collecting electrodes 12and 13 erected and arranged in a height direction of the absorptiontower 1200. The gap G1 between each of the collecting electrodes 13 andan associated one of the discharge electrodes 12 may be 50 mm to 70 mm.

A clearance groove 135 is formed in both ends of the lower side of eachcollecting electrode 13, and the first setting beams 14 are installed topass through the clearance grooves 135. The upper ends of the avoidancegrooves 135 are formed above the first reinforcing rod to prevent theshort circuit between the collecting electrode 13 and the dischargeelectrode 12.

A high voltage is applied to the discharge electrode 12, therebygenerating a corona discharge between the discharge electrode 12 and thecollecting electrode 13 and generating an electrostatic force. In thepresent disclosure, a high voltage may be in a range of 10 KV to 120 KV.The discharge electrode 12 can be charged to a predetermined voltage,and the predetermined voltage may be in a range of 10 KV to 120 KV.

In other words, the electrostatic precipitator module 100 includes anarrangement of a plurality of the discharge electrodes 12 and aplurality of the collecting electrodes 13, which are alternatelydisposed and spaced apart from each other, and the discharge electrodes12 are charged to a predetermined high voltage for generating a coronadischarge between the electrodes 12 and 13.

During the flow of exhaust gas to the generation region of the coronadischarge and the electrostatic force, particulate substances arecharged by combination with the ions (electrons) generated by the coronadischarge and the charged particulate substances adhere to thecollecting electrodes 13 by the electrostatic force.

Each collecting electrode 13 may have a lower edge 134 inclined withrespect to the ground, that is, inclined with respect to the force ofgravity, and the discharge guide 21 for forming a channel is installedbeneath a lowermost point 138 positioned at the bottom (downward) end ofthe inclined portion. Here, the inclined portion may be formed of thelower edge 134, and the lower edge (inclined edge) 134 may beconstructed of two separate lower edge portions extending toward eachother and thus combining to make up the width of an associatedcollecting electrode 13, as in the embodiments depicted in the drawingsherein. Alternatively, the lower edge 134 may be constructed of a singleand continuously configured lower edge extending the entire widthdirection of the associated collecting electrode 13. Thus, the lowermostpoint 138 may be disposed at a center of the collecting electrode 13, asin the embodiments depicted in the drawings herein, or may be disposedat one lateral extreme (side ends) or the other of the collectingelectrode 13 in the width direction in the event of a single andcontinuously configured lower edge 134. On the other hand, in the eventof two separate lower edge portions of unequal length, the lowermostpoint 138 may occur at an off-center point of the collecting electrode13.

The discharge guide 21 is disposed at the widthwise center of thecollecting electrode 13, and a width GW of the discharge guide 21 issubstantially smaller than a width CW of the collecting electrode 13(FIG. 6). For example, the discharge guide 21 may have a width GWranging from 1/100 to 1/10 of the width CW of the collecting electrode13.

In an embodiment, since the lower edge 134 of the collecting electrode13 is inclined toward the widthwise center of the collecting electrode,i.e., from opposite side ends of the collecting electrode, the center isdisposed at a lower position than either of the side ends. Thus, washwater flowing along the surfaces of the collecting electrode 13 iscollected to the lowermost point 138, which is the lowest position alongthe lower edge of the collecting electrode 13 and in an embodiment maybe the center of the collecting electrode 13.

A fixing hole 137 is formed in the center of the lower side of each ofthe collecting electrodes 13, near the lowermost point 138, and a hangerfixing rod 23 extending in the stacking direction of the collectingelectrodes 13 is inserted though the fixing holes 137. The hanger fixingrod 23 is coupled to the support hanger 25 to fix the support hanger 25to the collecting electrodes 13 (FIG. 6).

FIG. 6 illustrates the support hanger 25 and the discharge guideaccording to the first embodiment of the present disclosure.

Referring to FIG. 6, the support hanger 25 includes a lower support rod251 extending in the stacking direction of the collecting electrodes 13,and connection protrusions 252 protruding upward from the lower supportrod 251 to fit the lower edges of the collecting electrodes 13. Each ofthe connection protrusions 252 has a connection groove 254 formed forinsertion of the lower edge of the associated collecting electrode 13,and a support hole 253 formed for insertion of the hanger fixing rod 23.

The connection protrusion 252 may consist of two spaced plates, and theconnection groove 254 may be formed between the plates. The connectionprotrusions 252 are spaced apart from each other in the longitudinaldirection of the lower support rod 251 to be coupled to the lower edgesof the respective collecting electrodes 13. The support hole 253 isconnected to the fixing hole 137 so that the hanger fixing rod 23 isinstalled through the support hole 253 and the fixing hole 137. Thus,the support hanger 25 may be stably fixed to the lower edge of thecollecting electrode 13.

The discharge guide 21 is fixedly installed with respect to the supporthanger 25 and may be fixed to the lower support rod 251 by welding orthe like. The upper portion of the discharge guide 21 is open to formthe discharge guide 21 as a channel so that wash water flows through thechannel. The discharge guide 21 may be configured such that its bottomsurface, i.e., the channel surface, gradually decreases in height from alongitudinal center toward either extreme (side end) of the dischargeguide 21. Although the embodiment of the drawings depicts the dischargeguide 21 having a highest point located at the guide's longitudinalcenter, the highest point may occur anywhere along the discharge guide.

Thus, the wash water introduced into the discharge guide 21 may flow toeither side end of the discharge guide 21. Discharge pipes (not shown)for discharge of wash water may be connected to both side ends of thedischarge guide 21.

According to the first embodiment as described above, since the loweredge 134 of the collecting electrode 13 is inclined and the supporthanger 25 and the discharge guide 21 are installed with respect to theinclined lower edge of the collecting electrode 13, it is possible tostably discharge wash water while obstructing the flow of exhaust gas toa minimum.

As illustrated in FIGS. 2 and 3, each of the first tie rods 16 is fittedto the plurality of discharge electrodes 12 and is installed through thesecond holes 133 formed in the collecting electrodes 13 so as not tocome into contact with the collecting electrodes 13. The plurality offirst tie rods 16 are coupled to the upper portion of each dischargeelectrode 12 and to the lower portion of each discharge electrode 12.Among the plurality of first tie rods 16, the lower first tie rods 16are fixed to a lower support 51 and the upper first tie rods 16 arefixed to an upper support 61. An end of each of the first tie rods 16are provided with a threaded protrusion.

Each of the second tie rods 17 is fitted to the plurality of collectingelectrodes 13 and is installed through the first holes 123 formed in thedischarge electrodes 12 so as not to come into contact with thedischarge electrodes 12. The second tie rods 17 are coupled to therespective upper and lower portions of each collecting electrode 13, andthe longitudinal ends of the second tie rods 17 may be fixed to thecollecting electrode 13, though the present disclosure is not limited tothis configuration. That is, the second tie rods 17 may be fixed toanother member in the absorption tower 1200.

Each of the first and second tie rods 16 and 17 may have a spacerinstalled to maintain the gap between the discharge electrode 12 and thecollecting electrode 13. The spacer of the discharge electrode 12 may beinstalled such that it passes through the second hole 133 and thelongitudinal end of the spacer abuts the surface of the dischargeelectrode 12. The spacer of the collecting electrode 13 may be installedsuch that it passes through the first hole 123 and the longitudinal endof the spacer abuts the surface of the collecting electrode 13.

Each of the first setting beams 14 extends in the stacking direction ofthe discharge electrodes 12 and is formed with a plurality of lowerslots 143 into which the side ends of the respective dischargeelectrodes 12 are inserted. The first reinforcing rod 121 of eachdischarge electrode 12 is inserted through and installed on the firstsetting beams 14, and the lower end of the first reinforcing rod 121 issupported by the first setting beams 14.

Each of the second setting beams 15 extends in the stacking direction ofthe collecting electrodes 13 and is formed with a plurality of upperslots 156 into which the side ends of the respective collectingelectrodes 13 are inserted. The upper slots 156 are spaced apart fromeach other in the longitudinal direction of the second setting beam 15,and the second setting beam 15 may be positioned above the first settingbeam 14. As illustrated in FIG. 3, the center setting beam 18 isinstalled at the center of an upper portion of each collecting electrode13 in the width direction. The center setting beam 18 has a T-shape andis formed with a plurality of slots into which the upper portion centersof the respective collecting electrodes 13 are inserted.

The second reinforcing rod 131 is fixed to each of the collectingelectrodes 13 and is inserted into the second setting beams 15. Thesecond reinforcing rod 131 is installed through the second setting beams15 and the lower end of the second reinforcing rod 131 is supported bythe second setting beams 15.

In the electrostatic precipitator module 100 according to the firstembodiment as described above, the gaps between the respective dischargeelectrodes 12 and the respective collecting electrodes 13 can bemaintained and stably fixed by the first tie rods 16, the second tierods 17, the first setting beams 14, and the second setting beams 15.

FIG. 7 illustrates the frame assembly 20 according to the firstembodiment of the present disclosure.

Referring to FIGS. 2 and 7, the frame assembly 20 includes lower frames30, a tubular girder 48, upper supports 61, lower supports 51, lockingmembers 70, and insulating connection members 40.

The lower frames 30 extend in the stacking direction of the dischargeand collecting electrodes 12 and 13 and are supported by the insulatingconnection members 40. Two lower frames 30 are disposed in parallel witheach other, and two insulating connection members 40 are installed withrespect to each of the lower frames 30. The lower frames 30 are eachprovided with a plurality of cradles 35 protruding inward, toward theopposite lower frame 30, and the first setting beams 14 are mounted onthe cradles 35. The lower frames 30 are charged to the predeterminedhigh voltage, whereby the first setting beams 14 and the dischargeelectrodes 12 are charged to the same high voltage through the lowerframes 30.

The lower supports 51 are fixedly installed on the lower frames 30 andare respectively disposed on both outer sides and at the center of theelectrostatic precipitator module 100. Each of the lower supports 51includes side protruding portions 51 a located on the lower frames 30,lower protruding portions 51 b protruding downward to abut the sidesurfaces of the lower frames 30, and a support bar 51 c to which thefirst tie rods 16 are fixed.

The lower support 51 has a plurality of connectors 55 installed forcoupling of the first tie rods 16, and the first tie rods 16 are fixedlyconnected (screwed) to the connectors 55. The longitudinal one ends ofthe first tie rods 16 are fixed to the outer lower supports 51, and thelongitudinal other ends thereof are fixed to the central lower support51.

The insulating connection members 40 are installed with respect to thelower frames 30. Each insulating connection member 40 is provided with ahigh-voltage terminal rod 42 for applying the high voltage to theassociated discharge electrodes 12 and with a lower insulator 41 forinsulation from the terminal rod 42.

The high-voltage terminal rod 42 has an anchor 43 installed to supportthe associated lower frame 30. Thus, the high voltage is applied to thedischarge electrodes 12 through the lower frames 30 and the firstsetting beams 14. The lower frames 30 are suspended from the insulatingconnection members 40.

The insulating connection members 40 are inserted into the tubulargirder 48 having an internal space, and the tubular girder 48 is formedin the same direction as the lower frame 30. The tubular girder 48 maybe fixedly installed on the inner wall of the absorption tower 1200 andmay be provided with a purge air supply pipe (not shown)

The second setting beams 15 are fixed on the upper surface of thetubular girder 48. The lower ends of the second setting beams 15 may befixed to the tubular girder 48 by welding or the like. The secondsetting beams 15 are disposed in the same direction as the longitudinaldirection of the tubular girder 48.

The upper supports 61 are disposed in an upper side of the electrostaticprecipitator module 100 and are respectively disposed on both outersides and at the center of the electrostatic precipitator module 100.

Each of the upper supports 61 has a plurality of connectors 65 installedfor coupling of the first tie rods 16, and the first tie rods 16 arefixedly connected (screwed) to the connectors 65. One end of each firsttie rod 16 is fixed to one of the outer upper supports 61, and the otherend is fixed to the central upper support 61.

The locking members 70 are connected to each of the outer upper supports61 to press and support the upper support 61. In order to reduce thevibration of the electrostatic precipitator module 100, the lockingmembers 70 are installed to press the upper support 61 in an inwarddirection.

The locking members 70 are fixed to the inner wall of the absorptiontower 1200, and each locking member 70 has an upper insulator (notshown). A nozzle (not shown) for injection of air may be installed ineach of the locking members 70 to prevent a short circuit, and a purgeair supply pipe (not shown) for supplying air to the locking member 70may be installed.

As shown in FIG. 2, the locking member 70 may include a connection rod71 protruding downward, and a pressing support member 72 coupled to thelower end of the connection rod 71 to press the upper support 61 in acentral direction. When the upper support 61 is installed in a pressedstate as described above, the vibration of the electrostaticprecipitator module 100 can be efficiently reduced.

Hereinafter, an electrostatic precipitator module according to a secondembodiment of the present disclosure will be described.

FIG. 8 illustrates one collecting electrode 230 according to the secondembodiment of the present disclosure.

Referring to FIG. 8, the electrostatic precipitator module according tothe second embodiment has the same structure as the electrostaticprecipitator module according to the first embodiment except forcollecting electrodes 230. Therefore, a duplicate description of thesame configuration will be omitted.

Each of the collecting electrodes 230 according to the second embodimenthas a flat plate shape, and is formed with a plurality of second holes233 through which the first tie rods 16 pass. The collecting electrode230 includes a second reinforcing rod 231 disposed at the upper portionthereof to support the collecting electrode 230. The second reinforcingrod 231 is fixed to the upper end of the collecting electrode. Thesecond reinforcing rod 231 is longer than the width of the collectingelectrode 230 to protrude from both side ends of the collectingelectrode 230. The collecting electrode 230 has clearance grooves 235formed at both lower side ends.

The collecting electrode 230 may have a lower edge 234 inclined withrespect to the ground, and a discharge guide is installed beneath thelowermost point of the inclined portion. The lower edge 234 of thecollecting electrode 230 is inclined downward with respect to the groundfrom both side ends of the collecting electrode to its widthwise center.Accordingly, the center of the collecting electrode 230 is disposed at alower position than either side end.

In addition, a guide protrusion 236 is formed on a lower portion of thecollecting electrode 230 and is inclined downward toward the center ofthe collecting electrode 230. The inclined guide protrusion 236 extendsfrom the widthwise side end of the collecting electrode 230 to itscenter. The inclined guide protrusion 236 is open at a positioncorresponding to the widthwise center of the collecting electrode 230,enabling the wash water flowing along the surface of the collectingelectrode 230 to collect at the center of the collecting electrode,which is the lowest position of the collecting electrode 230 along itslower edge.

Each of the collecting electrodes 230 has a fixing hole 237 formed nearthe center of its lower edge, and the hanger fixing rod 23 extending inthe stacking direction of the collecting electrodes 230 is inserted intothe fixing hole 237. In addition, a discharge guide for the transfer ofwash water is installed to the widthwise center of the collectingelectrode 230.

According to the second embodiment as described above, it is possible tomore reliably transfer wash water to the center of the collectingelectrode 230 by the formation of the guide protrusion 236.

Hereinafter, an electrostatic precipitator module according to a thirdembodiment of the present disclosure will be described.

FIG. 9 illustrates a support hanger and a discharge guide 310 accordingto the third embodiment of the present disclosure.

Referring to FIG. 9, the electrostatic precipitator module according tothe third embodiment has the same structure as the electrostaticprecipitator module according to the first embodiment except for thedischarge guide 310. Therefore, a duplicate description of the sameconfiguration will be omitted.

The discharge guide 310 is fixedly installed with respect to thewidthwise center of the lower edge of the collecting electrode andincludes sidewalls 312 and 314 and a bottom plate 316 connected to thelower ends of the sidewalls 312 and 314. The sidewalls 312 and 314 maybe disposed in parallel with each other, and the bottom plate 316 mayhave a curved surface for facilitating water flow.

Through such a structure, the upper portion of the discharge guide 310is open to form a channel for the discharge of wash water as in thefirst embodiment. Since the longitudinal central bottom of the dischargeguide 310 is higher than both side bottoms thereof, the wash water mayflow to both side ends of the discharge guide. A discharge pipe fordischarge of wash water may be connected to the longitudinal end of thedischarge guide 310.

The discharge guide 310 has a plurality of support rings 320 protrudingupward, and the support rings 320 are fixed to the upper ends of bothsidewalls 312 and 314. The support rings 320 may be spaced apart fromeach other in the longitudinal direction of the discharge guide 310. Thesupport rings 320 are caught by the hanger fixing rod installed to thelower portion of the collecting electrode 13.

According to the third embodiment as described above, since the supportrings 320 are formed in the discharge guide 310, the discharge guide 310can be stably fixed to the lower portion of the collecting electrode.

As is apparent from the above description, in accordance with theexemplary embodiments of the present disclosure, it is possible todischarge wash water with more ease since the wash water is guided tothe lowermost point of each collecting electrode when the lower edge ofthe collecting electrode is formed to be inclined downward.

While the present disclosure has been described with respect to thespecific embodiments with reference to the drawings, the presentdisclosure is not limited thereto. It will be apparent to those skilledin the art that various changes and modifications may be made withoutdeparting from the spirit and scope of the disclosure as defined in thefollowing claims.

What is claimed is:
 1. A desulfurization system comprising: anabsorption tower having an exhaust inlet and an exhaust outlet; aplurality of absorption solution supply pipes extending across theabsorption tower, each absorption solution supply pipe having a spraynozzle; an electrostatic precipitator module disposed on the absorptionsolution supply pipes and comprising a plurality of discharge andcollecting electrodes erected and arranged in a height direction of theabsorption tower; and a wash water supply unit disposed on theelectrostatic precipitator module, wherein each of the collectingelectrodes has a lower edge inclined downward with respect to a groundand a lowermost point at which wash water flowing down from thecollecting electrode is concentrated.
 2. The desulfurization systemaccording to claim 1, further comprising a discharge guide having achannel formed to receive the wash water and installed with respect tothe lowermost point of each collecting electrode.
 3. The desulfurizationsystem according to claim 2, wherein the discharge guide extends in astacking direction of the collecting electrodes, and has a bottomsurface that decreases in height toward either extreme of the dischargeguide.
 4. The desulfurization system according to claim 2, wherein eachcollecting electrode has a fixing hole formed near the lower edge. 5.The desulfurization system according to claim 4, further comprising: asupport hanger that extends in a stacking direction of collectingelectrodes and is fitted to the lower edge of each collecting electrode;a plurality of connection protrusions protruding upward from the supporthanger, each connection protrusion having a support hole aligned withthe fixing hole; and a hanger fixing rod inserted into the fixing holesand the support holes, wherein the discharge guide is fixed to thesupport hanger.
 6. The desulfurization system according to claim 1,further comprising a guide protrusion formed on a lower portion of eachcollecting electrode such that wash water flowing along surfaces of thecollecting electrode is transferred toward the center of the collectingelectrode, the guide protrusion extending in a width direction of thecollecting electrode.
 7. The desulfurization system according to claim1, further comprising: a first reinforcing rod that is fixedly installedat and protrudes from a lower portion of each discharge electrode and isconfigured to be inserted into slots formed in first setting beamsrespectively disposed at opposite ends of the first reinforcing rod,wherein the first setting beams are installed to pass through clearancegrooves respectively formed in both ends of the lower side of each ofthe collecting electrodes.
 8. The desulfurization system according toclaim 7, further comprising a second reinforcing rod that is fixedlyinstalled at and protrudes from an upper portion of each collectingelectrode and is configured to be inserted into slots formed in secondsetting beams respectively disposed at opposite ends of the secondreinforcing rod.
 9. The desulfurization system according to claim 1,wherein the exhaust inlet and the exhaust outlet have a different shape.10. The desulfurization system according to claim 9, wherein the exhaustinlet has a tubular shape through which an exhaust gas generated bycombustion of fuel consumed by a boiler is introduced and flows upward,and the exhaust outlet has a rectangular tube protruding laterally froman upper end of the absorption tower.
 11. The desulfurization systemaccording to claim 1, wherein the absorption tower comprises acylindrical section which has a circular cross-section, a rectangularcolumn section which is disposed above the cylindrical section and has arectangular cross-section, and an intermediate section which is disposedbetween the cylindrical section and the rectangular column section. 12.The desulfurization system according to claim 11, wherein theintermediate section has a contoured structure which includes a lowerend having a circular cross-section for communicating with thecylindrical section and an upper end having a rectangular cross-sectionfor communicating with the rectangular column section.
 13. Thedesulfurization system according to claim 1, wherein the absorptionsolution supply pipes allow a limestone slurry, which is supplied to andstored in a lower portion of the absorption tower, to be pumped andtransferred upward so that an absorption solution is sprayed as finedroplets through the spray nozzles.
 14. The desulfurization systemaccording to claim 13, further comprising an agitator installed in thelower portion of the absorption tower to accelerate a reaction bystirring the limestone slurry.
 15. The desulfurization system accordingto claim 11, further comprising a perforated plate for blocking finedroplets installed above the absorption solution supply pipe.
 16. Thedesulfurization system according to claim 15, wherein the perforatedplate is installed in the intermediate section.
 17. The desulfurizationsystem according to claim 1, further comprising a frame assembly onwhich the electrostatic precipitator module plate is installed in theabsorption tower.
 18. The desulfurization system according to claim 17,wherein the frame assembly comprises: lower frames that extend in astacking direction of the discharge and collecting electrodes and aresupported by insulating connection members, the lower frames beingcharged to a predetermined high voltage, wherein the dischargeelectrodes is charged to the same high voltage through the lower frames;and insulating connection members installed with respect to the lowerframes, each insulating connection member being provided with ahigh-voltage terminal rod for applying the high voltage to theassociated discharge electrodes and with a lower insulator forinsulation from the high-voltage terminal rod, wherein the insulatingconnection members are inserted into a tubular girder that is formed inthe same direction as the lower frame and is fixedly installed on aninner wall of the absorption tower.
 19. The desulfurization systemaccording to claim 18, wherein the frame assembly comprises: lowersupports that are fixedly installed on the lower frames and arerespectively disposed on both outer sides and at a center of theelectrostatic precipitator module, each of the lower supports includingside protruding portions located on the lower frames, lower protrudingportions protruding downward to side surfaces of the lower frames, and asupport bar; and upper supports that are disposed in an upper side ofthe electrostatic precipitator module and are respectively disposed onboth outer sides and at a center of the electrostatic precipitatormodule.
 20. The desulfurization system according to claim 19, whereinthe frame assembly comprises locking members that are fixed to an innerwall of the absorption tower and are installed to press the uppersupport in an inward direction in order to reduce vibration of theelectrostatic precipitator module.